rabanete



Patented Oct. 27, 1925.

UNITED STATES DAVID RABANETE, 0F BARCELONA, SPAIN.

CALCULATING MACHINE.

Application filed October 17, 1924.

To all whom t may conce/rn.'

Be it known that I, DAVID RABANETE, ka subject of the King of Spain,residing at Barcelona, Spain, have invented certain new and usefulImprovements in Calculating Machines, of which the following is aspecification.

My invention refers to calculating machines and has forits object toprovide a calculating machine, especially appropriate for carrying out.operations of multiplication and division, which shall be simple inconstruction, economical in cost and capable of being constructed of asize sufficiently small to enable it to be carried in the pocket.

The invention consists in combining in a machine of this class a seriesof endless ribbons each one of which has printed on it following oneafter the other the multiplication tables corresponding to the numbers 2to 9 inclusive.

These endless ribbons are mounted one alongside the other on pairs ofpulleys or rollers and one of these pulleys is provided with a flange orother appropriate means to enable it to be turned by the fingers withthe object of moving kthe ribbon.

The multiplication tables printed on each one of the ribbons have thefigures distributed in three columns, the figure in the center columnrepresenting the multipli- The invention will be fully understood,

by the detailed explanation which follows andwith the help of the-accompanying drawings in which Fig. l is an outside plan view .ofthecalculating machine showing the front face.

Fig. 2 is a similar View of the machine with the front cover removed.

F ig. 3 is a plan View of the back part of the machine.

Fig. 4 is a section of the machine on the line IV-IV of F igs.- l and 2,and

Serial N'o. 744,261.

Fig. 5 is a detail to an enlarged scale of a portion of one of theribbons.

In the form of construction shown in the drawings, the machine is madeup of a case l preferably of metallic sheeting which possesses on itsfront face four transverse slots 2 and on the back face an equal numberof similar slots. These slots extend across the whole width of themachine and alongside them are painted at 3 the numbers from 2 to 9which constitute the multipliers of the tables which can be seen throughthe corresponding slots.

In the inside of the case there is a series of endless ribbons 4 whichare arranged one alongside the other and are mounted upon rollers orpulleys 5 and 6 loosely mounted on the transverse axles 7, 8 in such away. that the pulleys 5, 6 corresponding to any particular one of theribbons can be turned without the pulleys of the neighbouring ribbonsbeing caused to revolve. In order to be able to turn these pulleysconveniently each of the lower pulleys 6 is provided on one of its sideswith an extension 9 of enlarged diameter in the form of a flange xed tothe pulley, which flange 9 protrudes through both sides of the machinethrough apertures 10 provided on the front and back faces of the case,in such a way that it is easy to revolve the flange with the fingersfrom the out-side of the case and thereby rotate the correspondingpulley 6 to move the corresponding ribbon 4.

Each one of the ribbons et has printed on it, the one following theother, the multiplication tables of the figures 2 to 9 inclusive, in themanner shown in Fig. 5, in which are seen the multiplication tables of4. and 5 and part of the tables of the figures 3 and 6.

Each one of these tables comprises the products of the correspondingmultiplier multiplied by all the figures from 0 up to 9. These tablesare divided into three columns; the figures of the central columnrepresent the multiplicands and the figures of the columns to the rightand left represent respectively the units and tens of the product ofeach one of these multiplicands multiplied by the multipliercorresponding to the particular table which multiplier is the figurepainted or engraved at 3 alongside the corresponding slot. Thus, forexam le, in the table of the figure 5, which is tiat indicated bytheletter 0, in Fig. 5, the figures in the central column, O, l, 2, 3 9represent the multiplicands Whil'erthe figures in the other 4two columnsread Without 'that of the central column represent the pro'duotof" eachone of the figuresf'of thef'central.fcolumn multiplied by the figure 5,which is the multiplier in this case. In the-fsaineway are arranged allthe other tables of all the ribbons.

Preferably, and Withthe object of facilitating the correspondingdistinction between the giires, those 'of the central column vvareprinted? different in size'fr'omthose ofthe tWo lateral columns orbetter still` different' 'in' c'olor, as xfor example, the figures 'in'the central column 'are xprinted in 'red 'and 'those-l of rtlieflateralColumns 'in black.

Preferably thertwo' inner sides ofeach offtlie Vendless ribbons'arejoined together by -'an inner ribbon 12 which limits the{movementor-the'endless ribbon, so that 'it' can travel only overthedistance 'necessary' to allow all the numbers of the 'correspondingtable to appear 'in "each one of 'the slots and thusv 'preventthenumbers of "the following As Will be understood, the number of end#vless ribbons' i Lborresponds to the 'maximum number. of iigures'whiclrmay compose the; multiplicandand f"theredie a greater or lesser `nrmiberof' ribbons are proi'fi'ded" iaccording `to thev ,capaci-ty i for'"which `|it 'is desired to Construct' the V'machine'.

product "of a -quaiitity'made upof various slot 'corresponding to the"figure 5,-' 'as 'fol lows Y @(4)0-v 1(2)@4 3(7)5 The "Central EfiguresItypedl iii parentheses are those which 'forni 4Vthe A'multi-'plica'ndand inthe practica-l constructinn of theY 'machine are printed] in red"or lin any other-manner Vwhich "Will :make tl'ieinst andA out*distinctly.

l In this case 'the' figures ffo'rniingithe produoti' of 42T imultiplied by gare obtained' in the'f*( "ll(i\\iii'gYy manner: The unitsare 5, which -is the unit"'of theTiglitliand ribbon. Tlfie tens areorinedtby adding the lligure 3,

which "represents the tens "ofthe -righthand `iibbon, totheYfigure-0'whichrepresents the units oftlieseeond -`ribbon, thatA is to"say, Eplus '0:3. The Ihundreds are-formed by adding the"figure` l,,which represents the tens 'of the second ribbon to the 'igure OWhiclirepresents the units of the third, and,

lastly-,theuthousandsare only the ligure 2,

which represents the tens of the third ribbon.

"Thns'finithis case, the product of 427 mul tiplied by 5 comes out as2,135.

It 'inust'beobserved that as the middle figures in each one of theribbons are printed in red or otherwise distinctively,*itf-follows` thateach one` of theiguresxof*the'protluctis obtained by Iaddingfthe twoblack? iiguresl which arev between each'trfvo adjacent-red iigures.This` facilitates the operation! very' greatly sincethe JtWo figuresWhiohare Ito' be added together appear to View oiienilong# side1vtheother. e

When'it is desired to inultiply-'a-nuinbercomposed 'of several guresfbyanother-'falso made y 'up of "several lfigures 'Y the procedure is: toobtaintheLpartial produetsresulting from` multiplying-:the inultiplioandV"by each one loit 'the figures oi' the multiplier and atter-Wardseectiiig the sum* total 'inv thel same Way asWhen'thecalculationiis-fmadefnientally.

In order to reduce the 'size of the machine, the' tables of thel'multipliers '0 V'and 1, Which are iknown' to all, have been-'omitted."

This machine may also be usedfforcarrying out: division in a l manner'inverse'to that employed W'hfen'multiplyin'g.Av If'it'is ide# sired"toldivideby a single igurefa begin; ning 'is' made 'by''establishingthe dividend or vthe"'quantity `the nea-rest*4 possible :toit, which if formedl by summing the -consecue tire 'blacl"'iignresbetween/each two red "figures andin this* casev thered figures representfthe quotient iof this quantity ob tai'riedl "by `lthe fdilvisor `whichzis-the figure. -printed or engraved finthe 'slot'.

y When tliedivisor is inade upfof 'several figuresw 'it isljmoreadvantageous vto proceed Vaszfollows A begiiiningiisjmade byestab#ll-ilshing the divisor -Withf :the -recl"figu resl Lon 'the ribbons 'and:in each fslot-4 the black iigures -give the product jfoffthisdivisorbythe 'ligure p'aintedalongside the slot.v Itfisthen ascertainedwhich ofth'ese products 'is -iiear 'esti to the' dividend- E and thefligure'- corresponding to' :the -slotl i'slthe first' figure: orf'the"quotient Therprod'uct of the "di'yidend/ is subtracted and by adding toit the figure following the second lfigure of vthe' quotient 'is found,'fand by` proceeding' successively vfin' the 1Asame`- manner;

I claim: '1. In a lcalc'ulating;machine, a ease/'pro- 'vided With' a 1series of transverse'slots 'eaeh one" 'of' which fcorrespond's 'to'V afigure which is a multipli-er,a-series- 'of endlesslribbons linsi-detheease eaclio'ne otxyhieh-has printed upon it Vthe multiplication `tablesrwith? the products ofAY the figure corresponding toeach 4one oftheslots multiplied'by the fiigures lll from O to 9, means forindependently moving each one of these ribbons so that the product ofthe figure corresponding to a multiplier by any of the figures from 0 to9, can be made to appear in one of the slots.

2. In a machine for multiplication and division, a case having a seriesof transverse slots, a series of endless ribbons arranged side by side,two axles loosely carrying reels upon which the endless ribbons arestretched, one of the reels of each ribbon being arranged for operationfrom outside the case for moving the endless ribbons, the ribbons havingtables printed upon them in each of which there is a central columnformed by the figures 0 to 9 and two lateral columns which indicate theproducts of each one of such figures multiplied by a multipliercorresponding to the particular table.

3. In a machine for multiplication and division, a case having a seriesof transverse slots, a series of endless ribbons arranged side by side,two axles loosely carrying reels upon which the endless ribbons arestretched, one of the reels of each ribbon being arranged for operationfrom outside the case for moving the endless ribbons, the ribbons havingtables printed upon them in each of which there is a central columnformed by the figures 0 to 9 and two lateral columns which indicate theproducts of each one of such figures multiplied by a multipliercorresponding to the particular table, a tie member connected acrosseach of the endless ribbons to limit movement thereof.

4. In a calculating machine, a case, a movable endless ribbon in thecase, characters carried by the ribbon and visible at times through thecase, and a tie member connected across the ribbon to limit the movementthereof.

In testimony whereof I affix my signature.

DAVID RABANETE.

